SS 2 First Term

LEARNING OBJECTIVES: BY THE END OF THE LESSON STUDENTS SHOULD BE ABLE TO:

Cognitive	i. Revise all topics of the term. ii. Consolidate architecture, storage and operating systems. iii. Practise number systems, logic and productivity tools. iv. Prepare for the end of term examination.
Affective	i. Appreciate the value of Revision in school, at home and in the community. ii. Show willingness to use digital tools carefully, safely and responsibly.
Psychomotor	i. Convert 45 to binary and to hexadecimal from memory. ii. Draw the truth tables for AND, OR and NOT. iii. List the seven OSI layers in order. iv. Write one spreadsheet formula and explain what it does.

Rationale: A computer follows the input, process and output model. Understanding review of Architecture, Memory and Storage, review of Number Systems and Logic, review of Networks and the Internet, review of Productivity Tools helps learners use digital technology confidently, safely and responsibly.

Pre-requisite Knowledge: In Week 10, learners studied Advanced Productivity Tools, including mail Merge and Templates, spreadsheet Formulas, Functions and Pivot Tables, advanced Presentations and Productivity Suites. The knowledge from that week is used again in this lesson.

Learning Material/Teaching Aid: Whiteboard, markers, computer or laptop where available, printed notes and charts on Revision, practical task sheets, learners' notebooks and pens.

Reference Materials: Digital Technology for Senior Secondary Schools (SS 2); NERDC Digital Technology Curriculum; Digital Technology SS 2 First Term Notes (Week 11); First Term examination and Continuous Assessment question papers.

LESSON DEVELOPMENT

Stage/Step (Time)	Teacher's Activities	Student's Activities	Learning Points
Introduction 5 MINUTES	Welcomes learners, revises Week 10 (Advanced Productivity Tools) with two quick oral questions, and asks what they already know about Revision. Elicits responses and writes the topic on the board.	Recall the previous lesson and share what they already know about Revision.	Connecting prior knowledge to Revision.
Step 1 6 MINUTES	Covers Review of Architecture, Memory and Storage: A computer follows the input, process and output model. The processor fetches, decodes and executes instructions, and the system bus carries data, addresses and control signals between the parts.	Listen, take notes and answer oral questions on "Review of Architecture, Memory and Storage".	Understanding: Review of Architecture, Memory and Storage.
Step 2 6 MINUTES	Covers Review of Number Systems and Logic: A number system is built on a base. Binary is base 2, octal is base 8 and hexadecimal is base 16. The value of a digit depends on its place value.	Copy the key points, give examples from school and everyday life, and ask questions on "Review of Number Systems and Logic".	Understanding: Review of Number Systems and Logic.
Step 3 6 MINUTES	Covers Review of Networks and the Internet: A network topology is the arrangement of devices and links. The main types are bus, star, ring, mesh, tree and hybrid. Networks are also classified by area as PAN, LAN, MAN and WAN.	Discuss in pairs, then report one point on "Review of Networks and the Internet" to the class.	Understanding: Review of Networks and the Internet.
Step 4 6 MINUTES	Covers Review of Productivity Tools: A word processor uses mail merge and templates to produce many personalised documents from one letter and a list. A spreadsheet uses formulas and functions to calculate, and a pivot table to summarise. A presentation uses advanced features to communicate clearly.	Respond to questions, complete the examples on the board and note down "Review of Productivity Tools".	Understanding: Review of Productivity Tools.
Practical Work 6 MINUTES	Guides learners through the practical work: (i) Convert 45 to binary and to hexadecimal from memory. (ii) Draw the truth tables for AND, OR and NOT. (iii) List the seven OSI layers in order. Moves round the class to check progress and correct unsafe or careless use.	Carry out the practical tasks individually or in pairs and record what they did in their notebooks.	Applying the lesson through hands-on practice.
Evaluation 3 MINUTES	Asks learners to: i. Revise all topics of the term. ii. Consolidate architecture, storage and operating systems. iii. Practise number systems, logic and productivity tools. iv. Prepare for the end of term examination.	Respond verbally and in writing to the evaluation questions.	Assessment and consolidation of the lesson content.
Conclusion 2 MINUTES	Recaps the main points: review of Architecture, Memory and Storage, review of Number Systems and Logic, review of Networks and the Internet, review of Productivity Tools. Links them to the assignment and previews Week 12: Examination.	Listen, ask questions and copy the assignment.	Reinforcement of key concepts and a preview of the next lesson.

Assignment: i. A factory needs a system that responds to a sensor within milliseconds, and a school needs one that runs on free software. Name the types of operating system, and compare the common operating systems with their strengths. ii. (a) Define the Central Processing Unit (CPU) and explain the specific roles of its two main components (ALU and CU). (b) Explain the concepts of Cold Booting and Warm Booting. (c) A system diagnostic log file consumes 5,120 Bytes of storage space. Convert this file size into Kilobytes (KB) and calculate how many bits that file occupies. Show all workings.